TIRE PRESSURE MONITORING SYSTEM (TPMS) DIAGNOSIS
TSB Revision
WHEEL AND TIRE
31-23
STEP 4. Check the TPMS transmitter acceleration.
Check the acceleration value sent by each TPMS transmitter
by performing the transmitter check using the scan tool (Refer
to
P.31-38), when the vehicle is stationary.
Item 31: Acceleration tire1
Item 32: Acceleration tire2
Item 33: Acceleration tire3
Item 34: Acceleration tire4
OK:
Acceleration value: 5G or less
Q: Is the check result normal?
YES : Replace the ETACS-ECU <Vehicles without Keyless
Operation System> (Refer to GROUP 54A ETACS
P.54A-260) or KOS&OSS-ECU <Vehicles with
Keyless Operation System> (Refer to GROUP 42B,
KOS&OSS-ECU
P.42B-132), and register ID codes
(Refer to P.31-42). Then go to Step 5.
NO : Replace the TPMS transmitter (Refer to P.31-47), and
register ID codes (Refer to P.31-42). Then go to Step
5.
STEP 5. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Turn the ignition switch (engine starting switch) from the
"LOCK" (OFF) to "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch (engine starting switch) to the
"LOCK" (OFF) position.
Q: Is DTC C1901 set?
YES : Start over at Step 1.
NO : The procedure is complete.
DTC C1902: Reset fail (warning threshold)
If there is any problem in the CAN bus lines, an
incorrect DTC may be set. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP
54C
CAN Bus Diagnostics Table P.54C-12).
.
DTC SET CONDITION
When a tire inflation pressure warning threshold
value cannot be reset due to a timeout (10 minutes
or more have passed in total at 35 km/h or more), the
TPMS receiver will set a diagnostic trouble code.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to be set are:
Malfunction of CAN bus line
Damaged wiring harness and connector
Malfunction of TPMS transmitter
Malfunction of ETACS-ECU <Vehicles without
Keyless Operation System>
Malfunction of KOS&OSS-ECU <Vehicles with
Keyless Operation System>
ID code registration failed
Registered IDs unmatched
Effective ID set unmatched
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